Artificial tooth.



H. A. GOLLOBIN & N. A. BORNSTEIN. ARTIFICIAL TOOTH.

APPLICATION nun 11.11.21, 1910.

989,245, mama Apr. 11,1911.

UNITED STATES PATENT OFFICE.

HARRY A. GOLLOBIN AND NEWTON A. BORNSTEIN, 0F NEWARK, .NEW JERSEY,ASSIGN- ORS TO THE DENTAL DENTURE IMPROVEMENT COMPANY, OF NEWARK, NEWJERSEY, A CORPORATION OF NEW JERSEY.

ARTIFICIAL 'roorH.

Specification of Letters Patent.

Patent-ed Apr. 11, 1911.

Application filed January 21, 1910. Serial No. 539,397.

T 0 all whom it may concern:

Be it known that we, HARRY A. GOLLOBIN, a subject of the Russian Empire,and New- TON A. BORNSTEIN, a citizen of the United States, and residentsof Newark, in the county of Essex and State of New Jersey, have inventeda new and useful Improvement in Artificial Teeth, of which the followingis a specification.

()ur invention relates to improvements in artificial teeth and moreparticularly to the shape of the tooth crown and to the shape of the pinreceiving hole, whereby a better fit may be obtained between the toothcrown and the part to which it is to be applied and in which thestrength of the tooth crown is materially increased both by its shapeand by the shape of the pin receiving hole.

A practical embodiment of our invention is represented in theaccompanying drawings, in which Figure 1 is a plan view of one form oftooth crown, Fig. 2 is a side view of the same, Fig. 3 is a front view,Fig. 4 is a section taken in the plane of the line AA of Fig. 1, lookingin the direction of the arrows, Fig. 5 is a section taken in the planeof the line B-B of Fig. at, looking in the direction of the arrows, Fig.6 is a side view of another form of tooth crown, and Fig. 7 is a centralsection from front to rear through the same.

The pin receiving hole 1 of the tooth crown is tapered, in the presentinstance, conical, thus permitting the bottom of the hole to be broughtdown toward the incisal edge 2 of the tooth crown a sufficient distanceto give the hole an extended pin receiving surface without danger ofweakening the labial wall 3 or the lingual wall 4: of the tooth crownopposite the bottom of the hole as is the case where the hole is made ofthe same diameter throughout or where its bottom is enlarged, as iscommon.

A seat 5, G, is provided at the mouth of the pin receiving hole 1 in thebase of the tooth crown and the base of the tooth crown is made concave,as shown at 7, the bottom of the cavity reaching to the mouth of the pinreceiving hole 1, thus dividing the seat 5, 6, at the mouth of the saidhole and furnishing an uninterrupted wall between the mouth of the holeand the side walls of the tooth crown.

It sometimes happens in bridge work that the lingual recession of thegum is more than the labial recession. In this particular case we haveshown the lingual wall 1 extended farther beyond the mouth of the pinreceiving hole 1 than the labial wall thus rendering the crownparticularly Well adapted for those cases where the lingual recession isgreater than the labial recession.

Parts shown and described but not claimed herein form subject-matterincluded in our co-pending applications filed of even date herewith,Serial Nos. 539,398 and 539,399.

What we claim is An artificial tooth crown having a tapered pinreceiving hole therein extending from its base toward its incisal edge,and a seat at the mouth of the hole, said base being concave and thebottom of its concavity extending to the mouth of the hole, thusdividing the seat and furnishing an uninterrupted wall between the mouthof the hole and the side walls of the tooth crown.

In testimony, that we claim the foregoing as our invention, we havesigned our names in presence of two witnesses, this 14th day ofJam'lary, 1910.

HARRY A. GOLLOBIN. NEWTON A. BORNSTEIN.

Witnesses:

F. Gnonee BARRY, C. S. SUNnonnN.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents,

. Washington, D. G.

